Grinding-machine.



H. BUERK & A. W. HAPPEL.

GRINDING MACHINE.

APPLICATION FILED NOV. 22. I916.

1,280,462. Patented June 19, 1917.

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H. BUERK & A. W; HAPPEL.

GRINDING MACHINE.

APPLICATION FILED NOV-22. 1916- Patented June 19, 1917.

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UNITED STATES PATENT OFFICE.

HANS BUERK AND ALBERT W. HAPPEL, OF BUFFALO, NEW YORK,ASSIG1\TORS TO THE COLUMBUS DIE, TOOL & MACHINE COMPANY,

OF OHIO.

OF COLUMBUS, OHIO, A CORPORATION GRINDING-MACHINE.

To all whom it may concern.

Be it known that we, HANS BUERK and ALBERT W. HAPPEL, citizens of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in Grinding- Machines, of which the following is a specification.

This invention relates to a grinding machine in which a rotatable grinding wheel of stone, emery, carborundum or other suitable material is employed, against which the object to be ground or polished is held.

The object of this invention is to improve the means for supporting the workpiece in its operative position relative to the front or exposed part of the grinding wheel.

This application is a division of application #103,755, filed June 15, 1916.

In the accompanying drawings: Figure 1 is a front elevation of a grinding machine embodying our improvements. Fig. 2 is an end elevation of the machine, partly in section, viewed from the left hand end thereof. Fig. 3 is. a fragmentary vertical section, on an enlarged scale, taken on line 3-3, Fig. 2.

Similar characters of reference indicate corresponding parts throughout the several views.

1 represents themain frame or base of the machine which is preferably made hollow and adapted to have its interior space connected with an exhausting device of any suitable character. The connection between this exhausting device and the hollow frame or base may be effected in any suitable manner.

On the upper part of the frame or base the same is provided with bearings 2 in which is journaleda horizontal longitudinal arbor, spindle or shaft 3 which may be turned by any suitable means. At its opposite ends the arbor is provided with grind ing wheels or disks 4, 4, which may be constructed of any suitable material. The employment of two grinding wheels produces a double machine and our improvements are represented in the drawings as associated with both of these wheels but in the follow ing description as to the details of our improvements relating to one of these wheels it is to be understood that this. description Specification of Letters Patent.

Patented J 11110 19, 1917. Divided. and this application filed. November 22-,

Serial No. 132,893.

applies equally to the mechanism associated with both of these wheels.

In closing the rear part of each of the grinding wheels is a hood 5 which is mounted on the main frame. The means which catch the grit and dust from the front of the grlnding wheel comprise a scoop or pan 6 which is arranged below the exposed front part of the grinding wheel and provided on its inner 7 which is mounted on the main frame so as to place the catch pan or scoop in communication with the interior of the hollow base, whereby any material discharged into this pan or scoop is sucked out of the same into the hollow frame from whence it is carried off by the suction device connected with the latter.

Improved means are provided for supporting the workpiece while the same engages the front or operativepart of the grinding wheel, these means being movable either into or out of their operative position so that the grinding wheel may be used either for grinding such articles without a support or the grinding wheel may be used while the article which is being operated upon is supported. This workpiece supporting mechanism in its preferred form is constructed as follows:

8 represents a horizontally swinging bracket or supporting arm. which is pivoted at its rear end by means of an upright hinge 9 on the adjacent end wall of. the main frame so that the bracket swings in a nearly horizontal plane, the. axis of the hinge being preferably inclined rearwardly slightly, as shown in Fig. 2, so, that the bracket will tendto remain in its rearward inoperative position by gravity. On its upper front part, this bracket has secured thereto the lower section or stand 10 of a work rest side with a horizontal tubular neckwhich lower section is capable of horizontal end of the bracket, and a screw nut lei: applied to the lower end of the clamping bolt and bearing against the underside of the bracket. On the upper part of the lower work rest section is arranged the upper section or head 15 of the work rest which latter is capable of vertical adjustment on the lower section bv means of a clamping bolt 16 projecting forwardly from the lower work rest section through a vertical slot 17 in the lower part of the upper work rest section and a screw nut 18 arranged on the front end of the clamping bolt 16 and bear ing against the front side of the upper work rest section. By moving the lower work rest section horizontally inwardly or outwardly on the bracket and moving the up per work rest section vertically on the lower work rest section. the top of the upper work rest section may be adapted to the size of the grinding wheel and also the character of the work which is to be ground on the wheel.

When the work rest is in use the bracket is swung forwardly so that the work rest stands in front of the peripheral part of the grinding wheel, as shown by full lines in Fig. 2 and the right of Fig. 1, but when the work rest is not required for use the same is swung backwardly out of the way into the position shown by dotted lines in Fig. 2 and at the left of Fig. 1. To permit of thus moving the work rest into and out of its operative position a clamping device is provided for detachably connecting the bracket with the adjacent part of the main frame. In its preferred form this clamp ing device comprises a tubular stop or boss 19 which is secured to the main frame in position to be engaged by the bracket when the work rest is in its operative position, and a rotatable spindle 20 journaled horizontally in a bearing 21 on the bracket and provided at one end with an external screw thread 22 engaging with an internal screw thread in the tubular stop 19 while its opposite end is provided with a handle 23 which bears against the outer side of the bracket while the latter is in its operative position, thereby securely holding the bracket and the parts mounted thereon in the proper position to permit of reliably supporting the workpiece on the work rest while the grinding wheel. is operating on the same. When the work rest is not required for use the spindle 20 is turned backwardly sufficiently to completely disengage its inner externally screw threaded end from the internal screw thread of the stop boss, thereby permitting the bracket and the parts associated therewith to be swung rearwardly adjacent to the rear part of the hood where it is out of the way when not required for use. At this time the fastening spindle is prevented from becoming disconnected from the bracket by reason of the handle 23 arranged on one side of the bracket and a shoulder 52% arranged on this spindle on the opposite side of tiis bracket, whereby this spindle and associated parts free to turn in the bracket but held against disengagement.

The inner side of the bracket 8 is recessed around the spindle 20, as shown at 25, so as to permit the threaded inner end of the spindle to be fully unscrewed from the stop boss 19 before swinging the bracket rearwardly into its inoperative position. The threaded end 22 is arranged in the recess 25 when the work rest is not in use thereby 3 preventing this thread from 'zeconiing covered with grit and dirt at this time and. retaining the same always in good condition for n'oniptly and easily connecting the bracket in its operative position with the frame.

In grinding machines as heretofore con structed the work support obstructed free access to all parts of the wheel which is par ticularly objectionable when grinding or operating on long, large or irregular shaped pieces of work. In the present improved construction all parts of the exposed surface of the grinding wheel are accessible, thus enabling the operator to properly cover a much wider range of work.

Furthermore, in the present construction there is no possibility of a work piece be coming wedged in between the support and the grinding wheel, thereby safeguarding against accidents to the machine and the operator.

On account of the work rest or support being always connected with the main frame of the machine the liability of the work rest being lost or displaced is avoided and it is always ready for use. Moreover the pivotal connections of the Work rest with the frame are not exposed and not liable to be coated with grit and dirt, and therefore do not interfere with the free and quick movement of the work rest into and out of its operative position for adapting the same to the character of the work which is being operated upon.

By employing a positive step against which the work rest is clamped while in its operative position a predetermined relation of the work rest and grinding wheel is always assured so that readjustments of the work rest are rendered unnecessary after the same has been once adapted for a particular kind of workpiece.

We claim as our invention:

1. A grinding machine comprising a frame, a grinding wheel rotatably mounted on said frame, a work rest movable toward and from the front part of said wheel and a positive stop which arrests the movement of the work rest in its operative position.

2. A grinding machine comprising a frame, a grinding wheel rotatably mounted on said frame, a work rest movable toward and from the front part of said wheel and a swinging bracket pivoted on said frame and carrying said work rest, the axis of the pivotal connection between said bracket and frame inclining rearwardly.

3. A grinding machine comprising a frame, a grinding wheel rotatably mounted on said frame, a work rest movable toward and from the front part of said wheel, a horizontally swinging bracket pivoted on said frame and carrying said work rest and means for holding said bracket in place while said work rest is in its operative position comprising a tubular stop boss secured to the frame and provided with an internal screw thread, and a clamping spindle journaled in a bearing on said bracket and provided at one end with a handle and at its opposite end with an external screw thread adapted to engage with the internal thread of said stop boss.

4. A grinding machine comprising a frame, a grinding wheel rotatably mounted on said frame to turn about a horizontal axis, a horizontally swinging bracket pivoted on the frame below said wheel, and a work rest mounted on said bracket and comprising a lower section movable on said bracket to ward and from its axis and an upper section movable vertically on said lower section.

5. A grinding machine comprising a frame, a grinding wheel rotatably mounted on said frame to turn about a horizontal i wvork rest section and. projecting through a slot in the bracket and provided with a screw nut engaging said bracket, and a clamping bolt arranged on said lower work rest section and projecting through a slot in said upper work rest section and provided with a screw nut engaging with said upper work rest section.

HANS BUERK. ALBERT WV. HAPPEL.

Copies of this patent mav be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

